<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="./js/velocity.min.js"></script>
  <script src="../vue.js"></script>
</head>

<body>

  <div id="app">
    <!-- // 双向数据绑定 -->
    <input type="text" placeholder="请输入要查找的内容：" v-model="query">
    <!-- // v-bind指令绑定了query和items变量，用来动态传递props -->
    <fade :query="query" :items="items">
      <!-- // fade为自定义组件的名称 -->
      <li v-for="(item, index) in ComputedList" :key="item.msg" :data-index="index">{{item.msg}}</li>
    </fade>
  </div>

  <template id="temp">
    <transition-group name="item" tag="ul" @before-enter="beforeEnter" @enter="enter" @leave="leave" :css="false">
      <slot></slot>
    </transition-group>
  </template>

  <script>
    Vue.component("fade", {
      props: ["query", "items"],
      template: "#temp",
      methods: {
        beforeEnter(el) {
          el.style.opacity = 0;
          el.style.height = 0
        },
        enter(el, done) {
          var delay = el.dataset.index * 150;
          setTimeout(function () {
            Velocity(el, { // Velocity调用钩子函数 第一个参数是挂载对象，第二个是参数是要设置的样式属性
              opacity: 1,
              height: "1.6em"
            }, {
              complete: done,
            })
          }, delay)
        },
        leave(el, done) {
          var delay = el.dataset.index * 150;
          setTimeout(function () {
            Velocity(el, {
              opacity: 0,
              height: 0
            }, {
              complete: done,
            })
          }, delay)
        },
      }
    })

    var vm = new Vue({
      el: "#app",
      data: {
        query: "",
        items: [{
            msg: '张三'
          }, {
            msg: '李四'
          }, {
            msg: '张芳芳'
          },
          {
            msg: '王琳琳'
          }, {
            msg: '冯圆'
          }
        ]
      },
      computed: {
        ComputedList() {
          var vm = this.query;
          var nameList = this.items;
          return nameList.filter((item) => {
            return item.msg.toLowerCase().indexOf(vm.toLowerCase()) !== -1;
          })
        }

      },
      methods: {

      }
    })
  </script>
</body>

</html>